Lathe-dog.



D. R. MoKIM.

LATHE DOG.

APPLIOATION FILED NO V. 20, 1907.

Patented 0011.13, 1908.

2 SHEETS-SHEET 1.

wahmm I D. R.' MOKIM.

LATHE DOG. APPLICATION FILED NOV. 20, 1907.

Patented Oct. 13,1908.

2 SHEETS-SHEET 2.

. To (ZZZ whom it may concern:

p DAVID RAiinoLPri McKIM, or wns'r JORDAN, UTAH.

Lam-nos.

Be it known that I, DAVIDRANDOLPH Mo- KIM, a citizen. of the UnitedStates, residing atWest Jordan, in the county of Salt Lake and State ofUtah, have invented a new. and

p useful Lathe-Dog, of which the following is cification. p hisinvention relates to lathe dogs.

The ob ect or the invention is to provide an ad ustable extension dog ofthis charac- "ter designed for driving work onlathecem ters for eitherstraight or taper ork and independently of the lathe center, said meansbeing disposed to shift to "permit the neces sary movement of the. workduring the op eration of the lathe.

Another object of the invention is to pi evide jaws of'novel-iform forengaging the work, said being independently adjustable and capable oflapping the center of the dog or chuck so as to engage work of a verysmall diameter.

Another object'is to provide an adj ust-able dog designedto beyieldinglyheld in a predetermined or normal position, there beingseparate means provided "whereby 'the dog can be held rigidlyin-ixanyposition desired.

With these and other *objects in view the invention consists of certainnovel features of construction and combinations of parts which will behcrcinafterniore fully .de-

' scribed and pointed out in tlicclainis.

In the accompanying drawings is shown the preferred form of theinvention.

lnsaid drawings: Figure 1 is a view partly in front elevation andpartlyin section of'adevi'c'e embodying the'p'rescnt in]: provenicnts. Fig. 2is a section on' l ne iii-m,

Fig. 1, one of the jaws bcingshown' in iiclc f vation- F 1g. 3 is a,section on line ;1 +;1 Fig. 2. "Fig. 4 182];

plan view ofa modified form ofdbg andshowing one of the jaw ad one ofthe jaws. Fig. J is a detail vicw jot justing screws in positiontherein.' Fig. 5

an cndvicw oi-the dog. l (5, 7, andS are side, plan, and end viewsI'CSPUCUWily pi once] the screw retaining devices.

Referring to the figures by cli aracters of reference, 1 designatesa"preferably *circiilar cas ngfor driver-hav ng :en'trahboss 2 upon "it.'rea'riace into dle of a lathe? Radially extending ribs 4i are arrangediip'on the rear face of the cap;

springs 13 they serve inally "cen tcrei flinch extend r. threaded-bore 3designed to re cciye the spin Patented Oct. 13, 1908.

ing or driver 1 and have sockets 5 designed to receive pins tofacilitate the rotation of the casing upon the lathe spindle. 1

Formed within the front face of the casing and extending diametricallytherein is a recess 6 the opposite side walls of which cl) diverge fromthe centers thereof to the ends of the recess,

which ends are closed by thin peripheral portions "('in which openings8.. are formed. Animate recesses 9 are formed. in the sidewalls ofrecess 6 and the front or outer ,walls of these recesses may be formed.v

of retaining means consisting of removable. face'plates 10 designed tobe detachably secured in any preferred manner as by means I of screwsand having their inner or adjoin: iii-gedges conformingin contourwiththecorresponding"Walls of the recess 6. Radially extending bores 11are formed within the walls of t e recesses 9 and receive screw. V plugsl2 insertible' from the outside cats-.75 ing 1 and constitutingabutments for springs 1.3. These springsserve to hold centering pins 14nori'nally projected into the recesses Q 0. Additional bores 15 aredisposed radially I within the walls of the recesses 9 and have sj)their walls screw threaded so as to be en gagcd by locking screwsIii-Which are inserti; ble from the outside of the casing l andy havingtheir inner ends tapered as at 17 and, t

disposed to project into the recesses 9. Formed within the inner orbottom face of recess (3 along a line intersecting the center of, thecasing are sockets 18 in each of which is i mounted a spring pressed pin'19 designed to normally pins constitute yieldablesupports for a dog 120 which is substantially rectangular in outline and is disposed to fitloosely within recess 6. This dog has rounded wings 21 at the sidesthereof )rojecting loosely into the recesses 9 and tin or the retainingmeans 10 and the dog and recess are so proportionedthat said dog, whenin its normal or central position, |ir-. -.1-.ion within the rcccss.-The pins' 1 4 constantly b ar upo'irthc wings 2L and as they.

is capable of movement in. any

are all subjected to the same pressure by to hold the dog norwithin therecess. Sockets 22 are forincd inthe wings 2l 'and are do' 106 signed torccivcthc tapered portions of screws 16 whenever it is. desired torigidly flock thedog within the recess.

project into the recess 6. 'lhesc QO A central orifice 23 is formedwithin the dog and a center 24 which is screwed into the bore 3 isdesigned to project through this orifice as indicated particularly inFig. 2. A T-shaped groove 25 is formed longitudinally within, andextends throughout the length of the dog and is intersected at thecenter by the orifice 23. That portion of the groove at each side of theorifice has a recess 26 into which extends a screw 27 havin stems 28 and29 projecting from its ends and journaled within recesses 30 asindicated particularly in Fig. 3. Stems 29 extend loosely into theopenings 8 and are provided with angular heads desi nod to be engaged bya wrench so that sai stems can be conveniently rotated.

Mounted on the jaws adjacent opposite portions of the orifice 23 areoppositely disposed slides 31 each of which has a T-shaped extension 32slidably mounted within the groove 25 and havin a longitudinallythreaded recess 32 slida ly mounted within the groove 25 and having alongitudinally threaded recess 3 engaged by one of the screws 27. Theslides are provided in their inner of adjoining faces with cylindricalsockets 34. Each socket is designed to receive a revoluble extension 35projecting from a jaw 36. This extension has an annular groove 37 forthe reception of a retaining screw or pin 38 and anti-friction devicessuch as balls 39 are preferably held upon the free end of the extens onby means of a re taining washer 40 and are designed to bear on the innerwall of the socket 34:. Rotation of the extension 35, is thus permittedwith but little friction. As shown in Fig. 1 the inner or adjoiningfaces of jaws 36 are preferably provided with dovetailed grooves ii inwhich are detachably mounted grip ing blocks 42. The working faces ofthese b ocks may be of any desired size and contour, ac-

cording to the work to be clamped thereby.-

In the drawings said faces have been shown concaved longitudinally andscrew threaded so as to efiiciently engage a threaded object such as abolt which is to be turned. The inner portion of the block 42 ispreferably cut away as indicated at 43 so that the two blocks can beadjusted close to the center 24 and lap thesame, thereby enabling themto en age work of small diameter.

or ordinary purposes the do 20 can be held rigidly within recess 6 byadjusting the screws 16 into sockets 22. The j aws 36 can then beadjusted toward or from each other so as to engage opposite portions ofwork upon the dog by adjusting the jaws 36 and after the work has beenproperly secured by the jaws the dog is free to oscillate with the work.Inasmuch as the ends of the do 20 project .into the recesses (3 it willbe obvious that said dog will be rotated with the driver 1 whether ornot the screws 17 engage the dog. While the jaws have been shownprovided with removable gripping blocks it is of course to be understoodthat if preferred the jaws may be used forgripping pur oses althoughremovable blocks such as disc osed are preferable.

Instead of providing the jaw adjusting screws as shown in Figs'l, 2 and3 each screw, as shown at 44 in fig. 4, may be provided within its outerend with an angular socket 45, said end being designed to projectthrough the opening 8 and be engaged by a suitable wrench. Adjacent themner end of the screw is formed an annular groove 46 disposed to receivea concave seat 47 formed in the outer end of a bearing block 48 havinglips 49 designed to partly lap the screw so as to prevent it frombecoming displaced. Each bearing block is seated within a slot or recess50 formed within the dog and is held therein by means the registeringrecesses 52 and 53 formed within the bearing block and the dogrespectively.

Instead of formin the jaws with antifriction bearings am? with gri pingblocks, the jaws can be constructed as s own in Figs. 6, 7 and 8, eachjaw being made of a single block of metal having a toothed recessedworking face 54 while its bottom face is concave as indicated at 55 andprovided with threads designed to engage the threads of the screw.

What is claimed is:

1. In a device of the character described the combination with a casinghaving a recess in one face thereof, and retaining means upon thecasing; of a dog movably mounted within the recess, wings thereon lappedby the retainin means, resilient means for centerin' the dog within therecess, and adjusta le jaws upon the dog.

2. The combination with a recessed casing; of a dog loosely mounted tobe movable universally within the recess, radially disposed springpressed means within the casing for centering the dog, spring pressedmeans within the casing for exerting an outward pressure upon the dog,and adjustable dogs upon the jaws.

3. In a device of the character described the combination with arevoluble casing having a recess? of a dog loosely mounted to be movableuniversally within the recess, retaining means for holding the dogwithin the recess, spring pressed centering means bearing upon the dog,spring pressed means for holding the dog normally against the,

of a screw threaded key 51 which engages" retaining means, a centerextending through the dog, and independently adjustable jaws upon thedog. i

4:. In a device of the character described the combination with a casinghaving are I .cess in one face thereof, and retaining means theretaining means, adjustable jaws upon upon the casing; of a dog movablymounted within the recess, wings thereon lapped by the dog, andresilient means for yieldingly holding the Wings against. the retaining7 means.

5. in a device of the character described the combination with a casinghaving a re- ("ess in one face thereof provided with recessed walls; ofretaining means extending across the recessed walls, a dog movablymounted within the casing and having Wings disposed Within the recessedwalls, ja'wsad jnstalily mounted upon the dog,-'and resilient ineans'forholding the dog normally means for normally holding the dog against 1the face plate and spaced from the bottom v of the recess to preventoscillation.

the combination with a casinghaving a recess, in one face thereof, and aface plate; of a dog mounted to partly rotate andto reciprocate andoscillate within the recess, and separate yieldable means fornormallyholdreciprocationand oscillation.

8. In a device of the character described the combination with a casinghaving a recess -in one face thereof, and a face plate; of a dog mountedto partly rotate and to oscillate within the recess, yieldable means fornormallyholding the dog against the face plate and spaced from thebottom of the recess to prevent oscillation, and means adjustablymounted within the casing for en gaging the dog to positively hold itagainst movementrclative to the casing. 's

In testimony that I claim the foregoing as my own, I have hereto affixedmy signa- Ture in the presence of twowitnesses.

DAVID RANDOLPH MGKIM Witnesses Juries CREIGHTON, D. (humor: Woon.

7. Bra deviceoi the character describeding the dog against the faceplateto prevent

